j = sqrt(-1);
z = exp(j*(-pi:pi/100:pi));
eval('plot(z)');
set(gcf,'units','normalized','position',[0.2,0.3,0.2,0.2])
title('Results by eval');
axis('square')
figure
set(gcf,'units','normalized','position',[0.2,0.3,0.2,0.2])
feval('plot',z);
title('Results by feval');
axis('square')